Vol. XVI-] 
1899 J 
Oberholser 011 the Genus Contopus. 33 ^ 
the group to which, in a restricted sense, Contopus is now 
applicable. 
Nuttallornis Ridgway. 
Nuttallornis Ridgway, Man. N. Amer. Birds, 1887, 337. 
Type, Tyrannus borealis Swainson. 
Chars, gen. — Resembling Horizopus, but tarsi shorter than middle 
toe with claw ; wing exceeding tail by about one-half the length of latter ; 
rictal bristles less developed (actually as well as comparatively shorter 
than in Horizopus viretis)-, first primary longer than the fourth. 
Geographic Distribution. — North America ^ south in winter through 
Central America and northwestern South America as far as Peru. 
Nuttallornis b orealis (Swainson). 
Tyrannus borealis Swainson, Fauna Bor.-Am. II, 1831, 141, pi. 35, 
Muscicapa inornata Nuttall, Man. N. Am. Birds, I, 1832, 282. 
Muscicapa cooperi Nuttall, Man. N. Am. Birds, I, 1832, 282. 
Contopus mesoleucus Sclater, Proc. Zool. Soc. 1859, 43. 
Geog. Dist. — The same as that of the genus. OmM, XVt.Oidr, j,),. 33 o- 33 U 
